Appendix A Vortex Manual
58 Issue 7 December 2009
APPENDIX A:
GLOSSARY
This manual uses the following terminology, acronyms and abbreviations.
%LEL Percentage of Lower Explosive Limit: a way of expressing the
concentration of a flammable gas.
%VOL Percentage by Volume: the concentration of a gas expressed as a
percentage of the total volume of the mixture of gases. Also
abbreviated to v/v.
The process of accounting for detectors
DCS Distributed Control System
Electromagnetic Compatibility
Ferro-electric Non-volatile RAM, this is the type of non-volatile
memory used in the Vortex node controller module.
Breaking the link between a channel and the associated outputs;
this is to avoid generating an alarm while testing or calibrating a
detector.
Intrinsically safe: used to describe a device or circuit designed
not to produce a spark or thermal effect capable of igniting a
given flammable atmosphere.
LED Light Emitting Diode
Protocol used on RS485 and RS232 interconnections.
PLC Programmable Logic Controller
Parts per million: a measure of gas concentration when the
concentration is very small.
Relay Logic The interconnection between detectors and relays, handled by
the Node Controller Module.
RS232 Hardware serial communications standard between personal
computers and Vortex. The Vortex system works with the
Modbus protocol over this link.
RS485 Master-slave serial communications standard, used between
PLCs or DCSs and Vortex. The Vortex system works with the
Modbus protocol over this link. This standard is multi-drop, that
is, a number of Vortex systems can be controlled by a single
master system.
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